Is this front or rear?Basically the more preload the harder the spring. It's a bit like a soft bed and a hard bed, two up you need more preload and solo less, it is a personal thing is suspension depending on how you ride. You might be best going to a suspension specialist and get it set up for your weight. Or have a look on the web for setting the sag. There is a lot to read!!!

Its my rear I tried understanding it on google head got minced. So is the canister thats got a pipe running to mono shock a damper then? That has a screw adjustment with a h and a s on ot? How does that work?

The preload rings adjust the tension in the spring, if you dont have enough preload on the spring then the shock will bottom out and be no use, too much preload and you will have a hard rear and the bike shock wont adsorb the bumbs, when riding 2 up this is the main one you want to adjust to compensate for the extra weight on the bike.

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HOW CAN WE WAIT UNTIL TOMORROW NIGHT..SAME BAT-TIME... SAME BAT-CHANNEL!!?